For colorful cichlids that won't kill everything, your best bets are probably blue rams and apistos. I have 0 experience with apistos, so I can't tell you anything at all about them, but I know those who have them swear they are the greatest fish in the world (I guess everybody does that about whatever type of fish they have, though).
I've had some experience with mbuna, which are amazingly colorful, but it was a non-stop brawl in the tank, so I wouldn't recommend those to someone who wants a peaceful tank.
I also don't think I can recommend a keyhole cichlid enough times. lol
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